2aa62f2bc9
This set of three packages: AppPkg, StdLib, StdLibPrivateInternalFiles; contains the implementation of libraries based upon non-UEFI standards such as ISO/IEC-9899, the library portion of the C Language Standard, POSIX, etc. AppPkg contains applications that make use of the standard libraries defined in the StdLib Package. StdLib contains header (include) files and the implementations of the standard libraries. StdLibPrivateInternalFiles contains files for the exclusive use of the library implementations in StdLib. These files should never be directly referenced from applications or other code. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11600 6f19259b-4bc3-4df7-8a09-765794883524
42 lines
1.7 KiB
NASM
42 lines
1.7 KiB
NASM
;------------------------------------------------------------------------------
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; Return the current FPU rounding mode.
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;
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; MASM implementation of the flt_rounds function from NetBSD.
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;
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; Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;------------------------------------------------------------------------------
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.code
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;_map BYTE 1 ; round to nearest
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; BYTE 3 ; round to negative infinity
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; BYTE 2 ; round to positive infinity
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; BYTE 0 ; round to zero
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;------------------------------------------------------------------------------
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; int
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; EFIAPI
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; fpu_rmode( void );
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;
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; VC++ always creates space for 4 parameters on the stack, whether they are
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; used or not. We use one for temporary storage since the only variant of
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; fnstcw saves to memory, NOT a register.
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;------------------------------------------------------------------------------
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internal_FPU_rmode PROC
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fnstcw [rsp + 8] ; save 16-bit FPU Control Word
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mov eax, [rsp + 8] ; get the saved FPU Control Word
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shr eax, 10
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and rax, 3 ; index is only the LSB two bits in RAX
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ret ; Return rounding mode in RAX
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internal_FPU_rmode ENDP
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END
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